From Ibn Abbas [رضي الله عنه] who said:

❝We used to call it Shibba’ataan [i.e. Zam Zam] we used to find it a blessed aid to fertility.❞

[Silsilah Ahadeeth As-Saheehah of Shaykh Al-Albaani, (No. 2685) | Translated By Abbas Abu Yahya Miraath al-Anbiyya]